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Thank you very much for your help. I kept struggling with finding the torque, using a different equation. That mass moment of inertia is going to help me a lottygerdawg said:Much more info needed for any kind of intelligent answer:
- This figure is plan (top) view, correct? If not, specify it so the community can determine the direction of the gravity vector. Gravity may add force requirements. Yes this is top view
- Is the door hinged? If hinged, where is the hinge? Specify it. Yes on the right side.
- If no hinged, about what axis does the door pivot? Specify it.
- door mass ≠ lbs. You better figure that out first.
- Torque = (mass moment of inertia) x (angular acceleration)
- (mass moment of inertia) will likely be estimated from inertia primitive formulas and modified with parallel axis theorem. Look 'em both up.
- (angular accel) is estimated α ≅ Δ(angular velocity)/Δ(time to accelerate)
- Add a bunch of fudge factors for safety, friction, gravity effects, windage effects, robustness, etc., and that will give your peak torque. Size the gearmotor for that.
the axis of rotation is the end of the door on the right sidejedishrfu said:The moment of inertia won't anyone here wanting to help if we don’t know the axis of rotation for the door.
A gearmotor is a type of motor that combines a gear reducer and an electric motor, typically used to produce high torque output at low speeds.
The amount of torque produced by a gearmotor depends on various factors such as the size and type of motor, gear reduction ratio, and load being driven. Generally, gearmotors can produce torque ranging from a few ounce-inches to several hundred pound-feet.
To determine the torque needed to close a door, you will need to know the weight of the door and the distance from the hinge to the point where the gearmotor will be mounted. You can then use the formula: Torque = Force x Distance. Keep in mind that the force required to close a door may vary depending on factors such as friction and air resistance.
The recommended torque for closing a standard door is typically between 10-20 pound-feet. However, this may vary depending on the weight and size of the door, as well as other factors mentioned earlier.
Yes, a gearmotor can be used to open and close a door. However, you will need to make sure that the gearmotor has a reversible function and that the torque is sufficient for both opening and closing the door. You may also need to consider adding a limit switch or other safety mechanisms to ensure proper operation.